<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<script type="text/javascript">
	document.write("fuck you bitch");
	document.write("<h1>this is head</h1>");
	document.write("<p>this is body</p>");
	document.write("<p>this is end</p>");
	var a = 1;
	var b = 2;
	var c = a+b;
	var d = "4";
	document.write(c);
// 	alert(c);
// 	alert(c+d);
	for (var i = 0; i < 10; i++) {
		alert(i)
	}
	var i = 0 ;
	while (i<10) {
		alert(i);
		i++;
	}
</script>
</body>
</html>